U.S. patent number 8,254,987 [Application Number 12/567,333] was granted by the patent office on 2012-08-28 for method and apparatus for transmitting data between radio equipment and radio equipment controls.
This patent grant is currently assigned to Fujitsu Limited. Invention is credited to Hajime Hasegawa, Nobumasa Kabashima, Tadayuki Sakama, Osamu Yamamoto.
United States Patent |
8,254,987 |
Kabashima , et al. |
August 28, 2012 |
Method and apparatus for transmitting data between radio equipment
and radio equipment controls
Abstract
Radio equipment (RE) is shared so as to use a plurality of types
of radio signals, and data (IQ data) of the plurality of types of
radio signals and monitoring control data are variably arranged in
a frame for transmitting and receiving data between the RE and
radio equipment controls (RECs). A plurality of types of data are
simultaneously transmitted and received by one communication link
between the RE and the RECs.
Inventors: |
Kabashima; Nobumasa (Kawasaki,
JP), Yamamoto; Osamu (Kawasaki, JP),
Hasegawa; Hajime (Kawasaki, JP), Sakama; Tadayuki
(Kawasaki, JP) |
Assignee: |
Fujitsu Limited (Kawasaki,
JP)
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Family
ID: |
39807888 |
Appl.
No.: |
12/567,333 |
Filed: |
September 25, 2009 |
Prior Publication Data
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Document
Identifier |
Publication Date |
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US 20100016013 A1 |
Jan 21, 2010 |
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Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
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PCT/JP2007/056565 |
Mar 28, 2007 |
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Current U.S.
Class: |
455/552.1;
375/356; 370/343; 375/336; 370/328 |
Current CPC
Class: |
H04W
88/10 (20130101); H04W 88/00 (20130101); H04W
92/12 (20130101) |
Current International
Class: |
H04B
7/00 (20060101) |
Field of
Search: |
;455/522.1 ;370/328,343
;375/336,356 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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2005048561 |
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May 2005 |
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WO |
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2005048624 |
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May 2005 |
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WO |
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2005048625 |
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May 2005 |
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WO |
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2005081563 |
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Sep 2005 |
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WO |
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2007006629 |
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Jan 2007 |
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WO |
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Other References
Ericsson AB, Huawei Technologies Co. Ltd, NEC Corporation, Nortel
Networks SA and Siemens AG, "CPRI Specification V2. 1"
http://www.cpri.info/spec.html, dated Mar. 31, 2006. cited by other
.
International Search Report dated Jun. 12, 2007. cited by
other.
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Primary Examiner: Gonzalez; Amancio
Attorney, Agent or Firm: Murphy & King, P.C.
Parent Case Text
CROSS-REFERENCE TO RELATED APPLICATIONS
This is a continuation of Application PCT/JP2007/056565, filed on
Mar. 28, 2007, the entire contents of which are incorporated herein
by reference.
Claims
What is claimed is:
1. A method for transmitting a frame storing data included in radio
signals between radio equipment for communicating with mobile
terminals by using the radio signals and radio equipment controls
for processing the radio signals, the method comprising: generating
bitmap information indicating a position in a transfer frame at
which data included in a radio signal is arranged; transmitting the
transfer frame storing the data by adding the generated bitmap
information thereto; extracting the data from the transfer frame on
the basis of the bitmap information added thereto; combining first
data included in a first radio signal and second data included in a
second radio signal that is different in transmission method from
the first radio signal, into third data, wherein the third data is
combined on the basis of third bitmap information that is obtained
by combining first bitmap information of the first data and second
bitmap information of the second data when simultaneous
transmission of the first and second data is required, and the
transfer frame storing the third data is transmitted with the third
bitmap information added thereto; and decomposing the third data
into the first and second data on the basis of the first or second
bitmap information obtained by decomposing the third bitmap
information added to the transfer frame storing the third data when
receiving the first or second data.
2. The method of claim 1, wherein the data is an IQ data block that
is configured as a set of pieces of IQ data including values
obtained by separating the radio signal into an I phase (In Phase)
and a Q phase (Quadrature Phase), an IQ data frame prescribed by
CPRI (Common Public Radio Interface) is used as the transfer frame,
and the bitmap information is added by using a Vender Specific
frame prescribed by the CPRI.
3. The method of claim 2, wherein the IQ data block is configured
to include one or more pieces of IQ data information, each being a
piece of IQ data used for one antenna carrier (AC), the bitmap
information is configured to include the number of one or more
radio-signal types and one or more pieces of IQ data arrangement
information corresponding to the respective one or more
radio-signal types, each of the one or more pieces of IQ data
arrangement information includes the number of one or more pieces
of IQ data information to be arranged in the IQ data block and a
length of each of the one or more pieces of IQ data information,
and pieces of IQ data information are arranged in the IQ data block
on the basis of the IQ data arrangement information with a
predetermined arranging method.
4. The method of claim 3, wherein the third bitmap information
includes first IQ data arrangement information on the first data
and second IQ data arrangement information on the second data, and
combining the first and second data into the third data and
decomposing the third data into the first and second data, are
performed on the basis of the first and second IQ data arrangement
information included in the third bitmap information.
5. The method of claim 3, wherein the one or more pieces of the IQ
data information are sequentially arranged in the IQ data block
from the top thereof, on the basis of the number of the one or more
pieces of IQ data information and the length of each of the one or
more pieces of IQ data information.
6. The method of claim 1, wherein the radio equipment has a
function for simultaneously performing radio communication with
both a first mobile terminal that transmits and receives the first
radio signal and a second mobile terminal that transmits and
receives the second radio signal, a communication link is provided
between a first radio equipment control that processes the first
radio signal and a second radio equipment control that processes
the second radio signal, and the first radio equipment control
transmits and receives the first data to/from the radio equipment
via the second radio equipment control by using the provided
communication link.
7. The method of claim 1, wherein a monitoring control frame is
provided to transmit and receive monitoring control data for
monitoring and controlling a radio signal between the radio
equipment and the radio equipment control, the monitoring control
data is transmitted and received by transmitting and receiving the
monitoring control frame storing the monitoring control data, first
monitoring control data for monitoring and controlling the first
radio signal and second monitoring control data for monitoring and
controlling the second radio signal, are combined into third
monitoring control data with a predetermined arrangement method, so
that the first and second monitoring control data is transmitted
and received by transmitting and receiving the monitoring control
frame storing the third monitoring control data, and the third
monitoring control data stored in the monitoring control frame is
decomposed into the first and second monitoring control data when
the monitoring control frame storing the third monitoring control
data is received, so that the first or second radio signal is
monitored and controlled on the basis of the decomposed first or
second monitoring control data.
8. The method of claim 7, wherein the monitoring control frame is
configured by using an HDLC frame prescribed by the CPRI.
9. The method of claim 7, wherein the radio equipment has a
function for simultaneously communicating with both a first mobile
terminal that transmits and receives the first radio signal and a
second mobile terminal that transmits and receives the second radio
signal, by using a radio signal, a communication link is provided
between a first radio equipment control that processes the first
radio signal and a second radio equipment control that processes
the second radio signal, and the first radio equipment control
transmits and receives the first monitoring control data to/from
the radio equipment via the second radio equipment control by using
the provided communication link.
10. Radio equipment for communicating with a mobile terminal by
using a radio signal, comprising: a first radio communication part
for performing communication of first data by using a first radio
signal; a second communication part for performing communication of
second data by using a second radio signal different in a
transmission method from the first radio signal; a data
communication part for performing communication with a radio
equipment control by arranging the first and second data in a
transfer frame; a bitmap information input/output part for
generating bitmap information defining a position in the transfer
frame at which the first and second data arranged, and for
extracting the bitmap information added to the transfer frame; and
a data combining/decomposing part for combining the first and
second data into third data, and for decomposing the third data
into the first and second data, wherein the third data is combined
on the basis of third bitmap information obtained by combining
first bitmap information of the first data and second bitmap
information of the second data, so that the transfer frame storing
the third data is transmitted and received with the third bitmap
information added thereto when simultaneous transmission of the
first and second data is required, the third data is decomposed on
the basis of the first and second bitmap information obtained by
decomposing the third bitmap information added to the transfer
frame when obtaining the first or second data from the radio
equipment control.
11. The radio equipment of claim 10, further comprising: a first
monitoring control part for monitoring and controlling the first
radio communication part on the basis of the first monitoring
control data received from the radio equipment control; a second
monitoring control part for monitoring and controlling the second
radio communication part on the basis of the second monitoring
control data received from the radio equipment control; and a
monitoring control data combining/decomposing part for combining
first and second monitoring control data into third monitoring
control data, the first monitoring control data being used for
monitoring and controlling the first radio communication part, the
second monitoring control data being used for monitoring and
controlling the second radio communication part, wherein the third
monitoring control data is combined by arranging the first and
second monitoring control data in a monitoring control frame with a
predetermined method when simultaneous transmission of the first
and second monitoring control data is required, so that the
monitoring control frame storing the third monitoring control data
is transmitted to the radio equipment control, and the third
monitoring control data stored in the monitoring control frame is
decomposed into the first and second monitoring control data when
obtaining the first or second monitoring control data from the
radio equipment control.
12. A radio equipment control for processing a radio signal,
comprising: a data communication part for transmitting a transfer
frame storing data; a bitmap information input/output part for
generating bitmap information indicating an arrangement position on
the transfer frame of the data, so as to transmit the transfer
frame including the data with the generated bitmap information
added thereto, and for extracting the data from the transfer frame
on the basis of the bitmap information added thereto when receiving
the data; and a data combining/decomposing part for combining the
first and second data into third data and for decomposing the third
data into the first and second data, wherein the third data is
combined on the basis of third bitmap information that is obtained
by combining first bitmap information of the first data and second
bitmap information of the second data when simultaneous
transmission of the first and second data is required so that the
transfer frame storing the third data is transmitted with the third
bitmap information added thereto, and the third data is decomposed
into the first or second data on the basis of the first and second
bitmap information obtained by decomposing the third bitmap
information added to the transfer frame when obtaining the first or
second data.
13. The radio equipment control of claim 12, further comprising: a
monitoring control part for monitoring and controlling first or
second radio signals handled by radio equipment communicating with
a mobile terminal by using the first or second radio signals; and a
monitoring control data combining/decomposing part for combining
first and second monitoring control data into third monitoring
control data, the first monitoring control data being used for
monitoring and controlling the first radio signal, the second
monitoring control data being used for monitoring and controlling
the second radio signal, wherein the third monitoring control data
is combined by arranging the first and second monitoring control
data in a monitoring control frame with a predetermined method so
that the monitoring control frame storing the third monitoring
control data is transmitted to the radio equipment when
simultaneous transmission of the first and second monitoring
control data is required, and the third monitoring control data is
decomposed into the first or second monitoring control data when
the third monitoring control data is received from the radio
equipment.
Description
FIELD
The present invention relates to a data communication technology
between a radio equipment control (REC: Radio equipment control)
and radio equipment (RE: Radio Equipment).
BACKGROUND
Current mobile communication systems follow market trends in that
new mobile communication systems are structured with radio signal
technology based on new communication systems so as to respond to
demands for an increase in speed and capacity in communication.
However, the introduction of a new mobile communication system
requires that the existing mobile communication system be
sequentially changed to the new mobile communication system in
accordance with market trends without a significant change thereof,
and that a plurality of types of the new mobile communication
system be used in combination.
FIG. 1 is a diagram illustrating an example of a network
configuration of a mobile communication system, in which two mobile
communication systems of a 3G (Third Generation) system 100 and an
LTE (Long-Term Evolution) system 200 as one of new mobile
communication systems having increased speed and bandwidth compared
with the 3G system, are provided concurrently.
For example, the 3G system 100 comprises: an RNC (radio network
controller) 120 having a control function of controlling a radio
network; an IP-RNC 120a; a BTS 110 having a function of managing
and converting a radio signal; and an IP-BTS 110a. With radio
signals based on a 3 G communication system, the BTS-110 and the
IP-BTS 110a in the 3G system 100 are linked to a mobile terminal 1
(referred to as 3G-MS in FIG. 1).
The LTE system 200 comprises: an aGW (access gateway) 220 having a
function of switching the radio signal and controlling a part of a
radio network and a BTS 210 (referred to as an LTE-BTS in FIG. 1)
having a function of managing and converting the radio signal. With
an IP protocol, the LTE-BTS 210 in the LTE system 200 is linked to
the aGW 220 as a higher-level device. Further, using a radio signal
based on LTE-system communication, the LTE-BTS 210 can be linked to
a mobile terminal 2 (referred to as LTE-MS in FIG. 1).
The 3G system 100 is linked to the LTE system 200 via an MSC
(mobile Switching Center) 910 having a function of switching a
radio signal of a core network 900 (referred to as CN), an IASA
(Inter Access System Anchor) 920 that manages connection between
different systems, and the aGW 220.
As the network example, the BTS 110 and the IP-BTS 110a are base
transceiver stations (BTSs) that control the mobile terminal 1
(3G-MS) using a radio signal in conformity with a communication
system of the 3G system 100. The LTE-BTS 210 is a base transceiver
station that controls the mobile terminal 2 (LTE-MS) using a radio
signal in conformity with a communication system of the LTE system
200, the mobile terminal 1 (3G-MS) and the mobile terminal 2
(LTE-MS) need to be simultaneously controlled by the same base
transceiver station so that seamless communication of data is
achieved between the mobile terminal 1 (3G-MS) and the mobile
terminal 2 (LTE-MS) using radio signals based on different
communication systems.
FIG. 2 is a diagram illustrating an example of a configuration of a
base transceiver station (BTS), in which the BTS 110 in the 3G
system 100 is depicted as a representative example.
The base transceiver station 110 includes a radio equipment control
111 (REC) that allows communication of data with the RNC 120 as a
higher-level device, the mobile terminal 1 (3G-MS), and the radio
equipment 112 (RE) that performs radio communication using a radio
signal in conformity with the communication system for 3G system.
The RE 112 is set for, e.g., an underground mall. Thus, the mobile
terminal 1 can also be used at a place where radio waves do not
sufficiently reach from the setting position of the REC 111. In
general, a plurality of the REs 112 are disposed and are connected
to one REC 111, via a communication link 8 using, for example, an
optical fiber. The REC 111 transmits and receives data
corresponding to the radio signal for the 3G system to the RE 112
via the communication link 8, thereby achieving communication of
data with the RNC 120 as a higher-level device.
Regarding the installation manner of the base terminal station
(BTS), in general, the radio equipment control (REC) and the radio
equipment (RE) are set apart from each other and are connected with
a one-to-n correspondence using optical fibers. The number of cases
where a Common Public Radio Interface (CPRI) is used as an
interface for the communication link between the REC and the RE,
has increased. The CPRI Specification V2.1 discloses the details of
the CPRI.
FIG. 3 is a diagram illustrating an example of an outline of a
communication protocol defined by the CPRI.
As for data (IQ data), an "IQ Data" frame of Layer 2 and "User
Plane" of Layer 3 are used. Further, an HDLC frame of "LAPB
Protocol" of the Layer 2 and "Control & Management Plane" of
the Layer 3 are used for transmission and reception of monitoring
control data in order to maintain and monitor the RE 112. A "Vender
Specific" frame of the Layer 2 is used for a specific purpose by a
vender. Hereinbelow, a transfer frame for transmitting and
receiving the data (IQ data) is referred to as an IQ data frame, a
transfer frame for transmitting and receiving the monitoring
control data is referred to as an HDLC frame, and a transfer frame
for transmitting and receiving the "Vender Specific" data is
referred to as a VS frame.
The details of the communication protocol defined by the CPRI are
disclosed in the CPRI Specification V2.1. Herein, a description
thereof is thus omitted.
SUMMARY
According to an aspect of the embodiment, there is provided a
method for transmitting a frame storing data included in radio
signals between radio equipment for communicating with mobile
terminals by using the radio signals and radio equipment controls
for processing the radio signals. The method including: generating
bitmap information indicating a position in a transfer frame at
which data included in a radio signal is arranged; transmitting the
transfer frame storing the data by adding the generated bitmap
information thereto; extracting the data from the transfer frame on
the basis of the bitmap information added thereto;
combining first data included in a first radio signal and second
data included in a second radio signal that is different in
transmission method from the first radio signal, into third data,
wherein the third data is combined on the basis of third bitmap
information that is obtained by combining first bitmap information
of the first data and second bitmap information of the second data
when simultaneous transmission of the first and second data is
required, and the transfer frame storing the third data is
transmitted with the third bitmap information added thereto; and
decomposing the third data into the first and second data on the
basis of the first or second bitmap information obtained by
decomposing the third bitmap information added to the transfer
frame storing the third data when receiving the first or second
data.
The object and advantages of the embodiment will be realized and
attained by means of the elements and combinations particularly
pointed out in the claims.
It is to be understood that both the forgoing general description
and the following detailed description are exemplary and
explanatory and are not respective of the embodiment, as
claimed.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a diagram illustrating an example of a network
configuration of a mobile communication system;
FIG. 2 is a diagram illustrating an example of a configuration of a
base transceiver station (BTS);
FIG. 3 is a diagram illustrating an example of an outline of a
communication protocol defined by the CPRI;
FIG. 4 is a diagram illustrating an example of a configuration of a
transfer frame of data of the CPRI;
FIG. 5 is a diagram illustrating an example of an arrangement of
data in a transfer frame in the case of the 3G system;
FIG. 6 is a diagram illustrating an example of an arrangement of
data in a transfer frame in the case of the LTE system;
FIG. 7 is a diagram illustrating an example of a configuration of a
base transceiver station (BTS);
FIG. 8 is a diagram illustrating an example of a configuration of a
base transceiver station (BTS), according to an embodiment;
FIG. 9 is a diagram illustrating an example of a configuration of a
radio equipment control (REC), according to an embodiment;
FIG. 10 is a diagram illustrating an example of a structure of a
radio equipment control (REC), according to an embodiment;
FIG. 11 is a diagram illustrating an example of a configuration of
radio equipment (RE), according to an embodiment;
FIG. 12 is a diagram illustrating an example of a configuration of
an IQ data block, according to an embodiment;
FIG. 13 is a diagram illustrating an example of a configuration of
bitmap information, according to an embodiment;
FIG. 14 is a diagram illustrating an example of bitmap information,
according to an embodiment;
FIG. 15 is a diagram illustrating an example of an operational flow
for combining and decomposing data, according to an embodiment;
FIG. 16 is a diagram illustrating an example of an operational flow
for combining and decomposing data, according to an embodiment;
FIG. 17 is a diagram illustrating an example of a transfer sequence
of data, according to an embodiment;
FIG. 18 is a diagram illustrating an example of a transfer sequence
of data, according to an embodiment;
FIG. 19 is a diagram illustrating an example of a configuration of
monitoring control data, according to an embodiment;
FIG. 20 is a diagram illustrating an example of a configuration of
monitoring control data, according to an embodiment;
FIG. 21 is a diagram illustrating an example of a transfer sequence
of monitoring control data, according to an embodiment;
FIG. 22 is a diagram illustrating an example of a transfer sequence
of monitoring control data, according to an embodiment;
FIG. 23 is a diagram illustrating an example of a transfer sequence
of monitoring control data, according to an embodiment;
FIG. 24 is a diagram illustrating an example of an operational flow
for monitoring and control, according to an embodiment;
FIG. 25 is a diagram illustrating an example of an operational flow
for monitoring and control, according to an embodiment;
FIG. 26 is a diagram illustrating an example of an operational flow
for monitoring and control, according to an embodiment; and
FIG. 27 is a diagram illustrating an example of an operational flow
for monitoring and control, according to an embodiment.
DESCRIPTION OF EMBODIMENTS
FIG. 4 is a diagram illustrating an example of a configuration of a
transfer frame of data of the CPRI, in which IQ data as the data is
represented by separating a radio signal into an I Phase (In Phase)
and a Q phase (Quadrature Phase).
The transfer frame of the IQ data comprises 16 words (W00 to W15),
and W=00 is used as a control word. Referring to FIG. 4, reference
numerals #Z.X.0 and #Z.X.1 represent control words.
A bit length of one word depends on a line bit rate of the CPRI,
and FIG. 4 illustrates an example in which a line bit rate of the
CPRI is 1228.8 Mbit/s. In this case, as shown by B=00, . . . B=15
in FIG. 4, one word comprises 16 bits, where B=00 is LSB and B=15
is MSB.
An area 800 is an IQ data block, and the IQ data as the data is
bit-mapped to the area and is transmitted between the radio
equipment control (REC) and the radio equipment (RE).
Since the CPRI Specification V2.1 discloses the details of the
structure of the transfer frame of the CPRI, a description thereof
is omitted here.
FIG. 5 is a diagram illustrating an example of an arrangement of
data in a transfer frame in the case of the 3G system.
Herein, an example is depicted of the case where the data, i.e.,
the IQ data, corresponding to two ACs (Antenna Carrier), is
accommodated in the IQ data block 800 which is depicted in FIG.
4.
The IQ data corresponding to one AC is referred to as IQ data
information. Then, reference numeral 801 denotes IQ data
information on the first AC, reference numerals 100 and Q00 denote
LSBs, and reference numerals 114 and Q14 denote MSBs. In the case
of the 3G system, the number of IQ bits for one AC is 15, and one
IQ bit includes information having two bits of an I bit and a Q
bit. Therefore, the length of the IQ data information is 30 bits.
The bits of the IQ data information in one AC are formed by
alternately arranging on time-series the I bit and Q bit in the
direction from the LSB bit to the MSB one. Similarly, reference
numeral 802 denotes the IQ data information on the second AC.
FIG. 6 is a diagram illustrating an example of an arrangement of
data in a transfer frame in the case of the LTE system, in which IQ
data information 801 and 802 corresponding to two ACs are
accommodated in one IQ data block 800.
Since thirty IQ bits for one AC are used and one IQ bit comprises
two bits of one I bit and one Q bit in the LTE system, the length
of the IQ data information is 60 bits.
As depicted in FIGS. 5 and 6, the number of bits of the IQ data
information is fixed every mobile communication system, i.e., for
each type of a used radio signal. Therefore, the bitmap on the IQ
data block of the CPRI link is peculiar to each mobile
communication system. Thus, since the bitmap on the IQ data block
in the transfer frame on one CPRI link is set depending on the
mobile communication system, it is difficult to simultaneously mix
and transmit the IQ data of different mobile communication systems
by a single CPRI link.
If a plural pieces of IQ data having different numbers of bits
corresponding to a plurality of different communication systems is
accommodated in one CPRI link, an area in the IQ data block needs
to be fixedly assigned to each of the plurality of mobile
communication systems. For example, a predetermined area of the IQ
data block may be assigned to an out-of-service mobile
communication system, and the use efficiency of IQ data block areas
is reduced. Upon expanding the system, since the assigned areas of
the fixed IQ data blocks need to be rearranged, the system can not
be flexibly expanded. Therefore, it is expected that it takes a
long time and a large cost to extend the system.
FIG. 7 is a diagram illustrating an example of a configuration of a
base terminal station (BTS), in which a plural types of mobile
communication systems are mixed.
As mentioned above with reference to FIG. 5, since the IQ data of
different types of mobile communication systems may not be
simultaneously transmitted by one CPRI link in the current
situation, each of the different types of mobile communication
systems needs to use independent CPRI link and dedicated RE.
Therefore, in order to simultaneously control the mobile terminal 1
and the mobile terminal 2 using different radio signals of the 3G
system and the LTE system as the two mobile communication systems
with a conventional method by the same base transceiver station
110b, as depicted in FIG. 7, the radio equipment control 111
(3G-REC) for the 3G system and the radio equipment control 211
(LTE-REC) for LTE system need to be disposed and the radio
equipment 112 (3G-RE) for 3G system and the radio equipment 212
(LTE-RE) for the LTE system further need to be set at the same
place. Moreover, the radio equipment 112 (3G-RE) and the radio
equipment 212 (LTE-RE) need to be connected to the 3G-REC 111 and
the LTE-REC 211 by different communication links 81 and 82,
respectively.
As mentioned above, in order to seamlessly perform radio
communication between terminals in a plurality of mobile
communication systems using different radio signals, the number of
devices to be set (particularly, the number of REs) is increased,
thereby increasing area needed for setting the devices, necessary
power, and cost for setting the devices. Therefore, a large
equipment investment will be required.
Further, in order to correctly control the data (IQ data), the
monitoring and control of an operating state of the RE for directly
controlling the radio signal is required. An operation system is
generally connected to the REC, and the monitoring control data for
maintaining and monitoring the RE is received and transmitted
between the REC and RE in response to an instruction from the
operation system. Since the monitoring control data is also fixedly
stored in a transfer frame (HDLC frame) for each mobile
communication system, the monitoring control data of a plurality of
mobile communication systems can not be simultaneously transmitted
and received by a single CPRI link.
As mentioned above, the bitmap on the IQ data block in the transfer
frame is fixed by one CPRI link, depending on the mobile
communication system to be used. Therefore, the IQ data of
different communication systems cannot be simultaneously
transmitted by one CPRI link. Further, since the monitoring control
data to the radio equipment (RE) is independently transmitted and
received to/from each of the mobile communication systems, a plural
pieces of monitoring control data corresponding to a plurality of
mobile communication systems cannot be simultaneously transmitted
and received by one CPRI link.
FIG. 8 is a diagram illustrating an example of a configuration of a
base transceiver station, according to an embodiment, in which a
3G-REC 10 and an LTE-REC 20, which are provided for two mobile
communication systems (3G system and LTE-system), are connected
with one communication link, and, also the LTE-REC 20 and one
common RE 30 are connected with one communication link. Although
the conventional RE radio-communicates only with a 3G-MSI as
depicted by a 3G-RE 112, the RE 30 simultaneously
radio-communicates with a 3G-MS1 and an LTE-MS 2 as two mobile
terminals that are controlled by two mobile communication systems,
respectively, according to an embodiment.
As compared with an example of the structure depicted in FIG. 7,
the number of REs set in an area 72 is reduced by half, i.e., one.
The 3G-REC 10 and the LTE-REC 20 need to be respectively connected
to an RNC for a 3G system as a higher-level device and an aGW for
an LTE system as a higher-level device and to transmit and receive
data in conformity with the mobile communication systems. That is,
a REC needs to be provided for each of different mobile
communication systems. However, according to the embodiment, in the
case of accommodating a large number of radio equipment REs, one RE
can use both the radio signal of the 3G system and the radio signal
of the LTE system, thereby greatly reducing equipment
investment.
FIG. 8 illustrates the example of a base transceiver station 310 in
the case of two mobile communication systems. Similarly in the case
of three or more mobile communication systems, in this case, the
third REC corresponding to the third mobile communication system
can be connected to the LTE-REC 20 via a communication link that
connects between the third REC and the common RE 30 (in this case,
the communication link between the conventional LTE-REC 20 and the
RE 30 is not required). In the case, the RE 30 can be configured to
radio-communicate with three types of mobile terminals respectively
corresponding to the three different mobile communication
systems.
Hereinafter, according to the embodiment, a description will be
given of setting the radio signal of the 3G system as the first
radio signal, and the radio signal of the LTE system as the second
radio signal.
FIG. 9 is a diagram illustrating an example of a configuration of a
radio equipment control (REC), according to an embodiment, in which
a configuration example of an REC device 10 (3G-REC) is depicted.
In the configuration example, a communication link (hereinafter,
referred to as a CPRI link) in conformity with the CPRI is used,
and IQ data as data and monitoring control data is transmitted and
received.
The 3G-REC 10 includes a CPRI communication part 11, a bitmap
information input/output part 12, and a 3G monitoring control part
13. Hereinafter, terms "information", "input/output", and
"communication" will be abbreviated as "info", "i/o", and "comm"
respectively, in the drawings.
The CPRI communication part 11 transmits and receives the data (IQ
data), monitoring control data, and VS data (Vender Specific data)
by using a transfer frame prescribed by the CPRI.
The bitmap information input/output part 12 generates the bitmap
information on the basis of the data (IQ data) of the 3G system
received from the upper device (RNC), and the received IQ data and
the generated bitmap information are transmitted to the LTE-REC 20
via the CPRI communication part 11. At this time, the IQ data is
stored in the IQ data frame of the CPRI, and the bitmap information
is stored in the VS frame of the CPRI.
Further, upon receiving the IQ data frame from the CPRI
communication part 11, the bitmap information input/output part 12
extracts the data (IQ data) for the 3G system from the received IQ
data frame on the basis of the bitmap information stored in the VS
frame, and transmits the extracted data to the upper device
(RNC).
The 3G monitoring control part 13 follows an instruction from an
operation system (OPS) connected to the 3G-REC 10 to monitor a
status of a card in the RE relating to the radio signal of the 3G
system and control the RE 30. Therefore, the 3G monitoring control
part 13 transmits request data including instruction information to
the RE 30 via the CPRI communication part 11. In this case, the
request data is stored in an HDLC frame of the CPRI and is then
transmitted. Further, the 3G monitoring control part 13 receives
the response data corresponding to the request data from the RE 30
via the CPRI communication part 11 (stored in the HRLC frame).
Then, the 3G monitoring control part 13 transmits data relating to
the response to the operation system (OPS) (not depicted in FIG.
9).
FIG. 10 is a diagram illustrating an example of a configuration of
a radio equipment control, according to an embodiment. In FIG. 10,
a structure example of the LTE-REC 20 in the structure example of
the BTS depicted in FIG. 8 is depicted.
The CPRI communication part 21 transmits and receives data to/from
the 3G-REC 10 by using the transfer frame in conformity with the
CPRI.
The CPRI communication part 21a transmits and receives data to/from
the RE 30 by using the transfer frame in conformity with the
CPRI.
The bitmap information input/output part 23 extracts the bitmap
information and the IQ data block from the transfer frame received
from the CPRI communication part 21 and sends the extracted bitmap
information and IQ data to the IQ data combining/decomposing part
22. At this time, the bitmap information is extracted from the VS
frame.
Further, the bitmap information input/output part 23 stores the
bitmap information received from the IQ data combining/decomposing
part 22 into the VS frame of the CPRI, sends the stored information
together with the IQ data block to the CPRI communication part 21,
so as to be transmitted to the 3G-REC 10.
The bitmap information input/output part 24 stores the bitmap
information received from the IQ data combining/decomposing part 22
together with the IQ data block into the VS frame of the CPRI, and
transmits the stored information to the RE 30 via the CPRI
communication part 21a.
Further, the bitmap information input/output part 24 extracts the
IQ data and the bitmap information from the transfer frame received
from the CPRI communication part 21a, and sends the extracted data
and information to the IQ data combining/decomposing part 22.
Upon receiving the IQ data from the upper device (aGW) (not
depicted in FIG. 10), the bitmap information input/output part 25
generates the bitmap information of the received IQ data, and sends
the generated information together with the IQ data to the IQ data
combining/decomposing part 22.
Further, upon receiving IQ data from the IQ data
combining/decomposing part 22, the bitmap information input/output
part 25 transmits the IQ data to the upper device (aGW) (not
depicted in FIG. 10).
Upon receiving the IQ data of the LTE system and the bitmap
information thereof from the bitmap information input/output part
25, as well as the IQ data of the 3G system and the bitmap
information thereof from the bitmap information input/output part
23, the IQ data combining/decomposing part 22 combines the IQ data
of the 3G system received from the bitmap information input/output
23, with the IQ data of the LTE system received from the bitmap
information input/output part 25, to generate the combined IQ data
which is then added with bitmap information thereof and sent to the
bitmap information input/output part 24, so as to be transmitted to
the RE 30. Upon receiving IQ data and the bitmap information
thereof from one of the bitmap information input/output 23 and the
bitmap information input/output part 25, the received IQ data and
the bitmap information thereof are, as they are, sent to the bitmap
information input/output part 24, so as to be transmitted to the RE
30.
Further, upon receiving the IQ data and the bitmap information
thereof from the bitmap information input/output part 24, the IQ
data combining/decomposing part 22 separates the received IQ data
into IQ data for each of types of radio signals. Then, the IQ data
combining/decomposing part 22 sends the separated IQ data of the
LTE system to the bitmap information input/output part 25, and adds
the bitmap information to the IQ data of the 3G system, sends the
separated IQ data of the 3G system to which the bitmap information
thereof is added, to the bitmap information input/output 23 so as
to be transmitted to the 3G-REC 10. When the IQ data received from
the bitmap information input/output part 24 includes the IQ data of
only one of the 3G system and the LTE system, the IQ data and the
bitmap information thereof are, as they are, sent to the bitmap
information input/output 23 in the case of the 3G system, and sent
to the bitmap information input/output part 25 in the case of the
LTE system.
The LTE monitoring control part 27 generates the monitoring control
data (hereinafter, described as "request data" indicating a request
regarding the RE 30 on the basis of the instruction information
received from the operation system (OPS) (not depicted in FIG. 10),
and sends the generated request data to the monitoring control data
combining/decomposing part 26. Types of request data includes, for
example, a report request for a status of a card loaded in the RE
and a control request on the card.
Upon receiving the request data from one of the CPRI communication
part 21 and the LTE monitoring control part 27, the monitoring
control data combining/decomposing part 26 stores the received
request data into the HDLC frame and transmits the stored data to
the RE 30 via the CPRI communication part 21a. Further, upon
simultaneously receiving request data from the CPRI communication
part 21 and the LTE monitoring control part 27, the monitoring
control data combining/decomposing part 26 combines the two pieces
of the received request data to create new request data, and
transmits the new request data to the RE 30 via the CPRI
communication part 21a.
Further, upon receiving response data corresponding to the request
data from the RE 30 via the CPRI communication part 21a, the
monitoring control data combining/decomposing part 26 divides the
received response data into two pieces of response data for the LTE
system and the 3G system. Then, the monitoring control data
combining/decomposing part 26 sends the response data from the LTE
system to the LTE monitoring control part 27, and transmits the
response data from the 3G system to the 3G-REC 10 via the CPRI
communication part 21.
FIG. 11 is a diagram illustrating an example of a configuration of
a radio equipment, according to an embodiment.
The CPRI communication part 31 transmits and receives the transfer
frame in conformity with the CPRI to/from the LTE-REC 20.
The 3G radio communication part 37 performs radio communication
with the mobile terminal 1 (3G-MS) using the radio signal for the
3G system.
The LTE radio communication part 38 performs radio communication
with the mobile terminal 2 (LTE-MS) using the radio signal for the
LTE system.
The bitmap information input/output part 32 extracts the bitmap
information and the IQ data block from the transfer frame received
from the CPRI communication part 31, and sends the extracted
information to the IQ data combining/decomposing part 33. At this
time, the bitmap information is extracted from the VS frame, and
the IQ data block is extracted from the IQ data frame.
Further, the bitmap information input/output part 32 stores the
bitmap information received from the IQ data combining/decomposing
part 33 into the VS frame of the CPRI, and transmits the VS frame
together with the IQ data frame to the LTE-REC 20 via the CPRI
communication part 31.
The bitmap information input/output part 32a sends the IQ data of
the 3G system received from the IQ data combining/decomposing part
33, to the 3G radio communication part 37. Further, the bitmap
information input/output part 32a adds the bitmap information to
the IQ data of the 3G system received from the 3G radio
communication part 37, and sends the IQ data having the bitmap
information added thereto, to the IQ data combining/decomposing
part 33.
The bitmap information input/output part 32b sends the IQ data of
the LTE system received from the IQ data combining/decomposing part
33 to the LTE radio communication part 38. Further, the bitmap
information input/output part 32b adds the bitmap information to
the IQ data of the LTE system received from the LTE radio
communication part 38, and then sends the IQ data having the bitmap
information added thereto, to the IQ data combining/decomposing
part 33.
Upon receiving the IQ data and the bitmap information from the
bitmap information input/output part 32, the IQ data
combining/decomposing part 33 divides the received data into the IQ
data for each type of the radio signals, sends the IQ data of the
3G system to the bitmap information input/output part 32a, and
sends the IQ data of the LTE system to the bitmap information
input/output part 32b.
Upon receiving the IQ data and the bitmap information from one of
the bitmap information input/output part 32a and the bitmap
information input/output part 32b, the IQ data
combining/decomposing part 33 sends the received IQ data and bitmap
information thereof to the bitmap information input/output part 32
without change. Further, upon simultaneously receiving the IQ data
and the bitmap information from both the bitmap information
input/output part 32a and the bitmap information input/output part
32b, the IQ data combining/decomposing part 33 combines the two
pieces of the received IQ data, adds the bitmap information of the
combined IQ data thereto, and sends the combined IQ data having the
bitmap information thereof to the bitmap information input/output
part 32.
The monitoring control data combining/decomposing part 34
decomposes the request data received from the CPRI communication
part 31 into pieces of data each corresponding to a different
mobile communication system, i.e., corresponding to each type of
the radio signals. Then, the monitoring control data
combining/decomposing part 34, in the case, sends the request data
of the 3G system to the 3G monitoring control part 35, and sends
the request data of the LTE system to the LTE monitoring control
part 36. At this time, when the received request data includes a
plurality of pieces of request data each corresponding to a
different mobile communication system, it is determined whether
priority control is required or not, by comparing types of the
plurality of pieces of request data each other. When priority
control is required, the request data is sent to the monitoring
control part corresponding to a mobile communication system to be a
target of a priority control (in the case of the 3G system, to the
3G monitoring control part 35 and in the case of the LTE system, to
the LTE monitoring control part 36), and the request data of a
mobile communication system that is not a priority control target
is discarded.
Upon receiving response data of the request data, simultaneously
from both the 3G monitoring control part 35 and the LTE monitoring
control part 36, the monitoring control data combining/decomposing
part 34 combines two pieces of the response data, and transmits the
combined response data to the LTE-REC 20 via the CPRI communication
part 31. Further, upon receiving response data from one of the 3G
monitoring control part 35 and the LTE monitoring control part 36,
the monitoring control data combining/decomposing part 34 transmits
the received response data to the LTE-REC 20 via the CPRI
communication part 31 without change thereof. However, upon
receiving response data in response to the request data of
priority, the monitoring control data combining/decomposing part 34
generates response data for the system that transmits the request
data discarded under priority control, combine the generated
response data and the received response data of priority, and
transmits the combined response data to the LTE-REC 20 via the CPRI
communication part 31.
The 3G monitoring control part 35 monitors and controls the state
of the card in the RE 30 corresponding to the 3G system on the
basis of the request data received from the monitoring control data
combining/decomposing part 34, and sends the response data
including the processing result thereof to the monitoring control
data combining/decomposing part 34.
The LTE monitoring control part 36 monitors or controls the state
of the card in the RE 30 corresponding to the LTE system on the
basis of the request data received from the monitoring control data
combining/decomposing part 34, and sends the response data
including the processing result thereof to the monitoring control
data combining/decomposing part 34.
Although above description indicates the case in which the number
of types of radio signals is two as a typical example, the case of
using three or more types of the radio signals can also be
configured in the similar manner.
As mentioned above, the RE 30 according to the embodiment can
perform radio communication with the mobile terminal by using a
plurality of types of radio signals each corresponding to a
different communication system. Further, transmission of data
between RE 30 and any one of a plurality of radio equipment
controls (RECs) provided for respective different radio signals can
be performed by connecting between the RE 30 and the plurality of
RECs using one communication link. Even if the number of types of
radio signals, i.e., the number of different mobile communication
systems increases, a total system can be configured by using only
one RE and RECs provided for respective different radio signals.
That is, since the RE does not need to be disposed for every mobile
communication system, as long as one RE has been set up once, it is
possible to easily deal with the case of increasing/decreasing the
number of subscribers among the mobile communication systems.
FIG. 12 is a diagram illustrating an example of a configuration of
an IQ data block, according to an embodiment.
Herein, at the head bit position of the individual IQ data
information, a number assigned to the IQ data information is
expressed in parentheses. That is, an example is given of arranging
four pieces of the IQ data information (1) to (4) in the IQ data
block.
The IQ data information is arranged in a lump for each type of the
radio signal used, i.e., for each mobile communication system. For
example, the IQ data information (1) and (2) for 3G-system as first
data is arranged from the head area, and the IQ data of the LTE
system information (3) and (4) as second data is arranged in an
area contiguous to the IQ data area (2), so that third data as
depicted in FIG. 12 is integrated. The data is combined on the
basis of the bitmap information, which will be described with
reference to FIGS. 13 and 14.
As mentioned above, according to the embodiment, pieces of IQ data
of different mobile communication systems are collected and
arranged so as not to overlap each other. The IQ data block is
transmitted and received among the 3G-REC 10, the LTE-REC 20, and
the RE 30, through one CPRI link.
FIG. 13 is a diagram illustrating an example of a configuration of
bitmap information, according to an embodiment.
Bitmap information 700 includes the number of radio-signal types
710 (n) and an IQ data arrangement information portion 720 which
includes IQ data arrangement information 720-1, 2, . . . , n
corresponding respective types of radio signals.
The IQ data arrangement information includes a radio-signal type ID
721, the number of IQ data information 722, IQ data validity
information 723, and an IQ data information length storing portion
724.
Herein, the IQ data validity information 723 indicates whether or
not the IQ data information is valid. For example, by correlating
IQ data information with validity bit indicating whether or not the
IQ data information is valid, the IQ data validity information 723
can be structured as a set of validity bits. For example, when a
value of a validity bit is 1, the corresponding IQ data information
is set as valid and, when a value of a valid bit is "0", the
corresponding IQ data information is set as invalid.
The IQ data information length storing portion 724 includes bit
lengths of one or more pieces of IQ data information, which are
arranged in the order of arrangement of the one or more pieces of
IQ data information in the IQ data block. Therefore, combining or
decomposing of IQ data can be performed by sequentially referring
to the sequence of lengths of IQ data information which is stored
in the IQ data information length storing portion 724, and by
sequentially performing setting or extracting of IQ data
information from the top of the IQ data block.
FIG. 14 is a diagram illustrating an example of bitmap information,
according to an embodiment.
In the case of the IQ data block as depicted in FIG. 12, the radio
signal identification ID of the 3G system is set as "1", and the
radio signal identification ID of the LTE system is set as "2".
Then, the bitmap information can be expressed with a value as
depicted in FIG. 14. In the case, the IQ data arrangement
information of the 3G radio signal 720-1 includes information on
two pieces of IQ data information each having a length of 30 bits.
The IQ data arrangement information of the LTE radio signal 720-2
includes information on two pieces of IQ data information each
having a length of 60 bits. In FIG. 14, expression B ` . . . `
means that " . . . " is a binary numeral.
As depicted in FIGS. 13 and 14 mentioned above, the bitmap
information is configured by simply arranging one or more pieces of
IQ data arrangement information for each of types of radio signals
without change. Therefore, a plurality of pieces of bitmap
information for a plurality of types of radio signals can be
combined and decomposed extremely easily. According to the
embodiment, IQ data blocks can be combined and decomposed
efficiently on the basis of the bitmap information with a simple
structure.
FIG. 15 is a diagram illustrating an example of an operational flow
for combining and decomposing data, according to an embodiment, in
which a flow upon combining (or decomposing) IQ data of a plurality
of types of radio signals into one IQ data block. Herein, an
example will be described of combining IQ data blocks of a
plurality of different types of radio signals into one IQ data
block. The process for decomposing the IQ data block obtained by
combining IQ data blocks of a plurality of different types of the
radio signals into respective IQ data blocks of different types of
radio signals on the basis of the bitmap information, can be
realized by the similar processing flow. That is, as described in
the parenthesis in FIG. 16, the decomposing process may be realized
by replacing a portion expressed as the "set" with "extract" in
FIG. 16.
In step S01, an IQ data setting position pointer, which is a
positional pointer in an IQ data block upon setting the IQ data
information to the IQ data block, is initialized.
In step S02, the number of radio-signal types is obtained from the
bitmap information, so as to determine the number of mobile
communication systems to be processed.
In step S03, one type of radio signal is selected from the bitmap
information, and processing for combining the IQ data information
with respect to the selected type of the radio signal is performed.
The details thereof will be described with reference to FIG. 16
later.
In step S04, it is determined whether or not the processing of all
the types of the radio signals has ended. When the processing of
all the types of the radio signals has ended (YES), the processing
ends. Otherwise (NO), the processing returns to step S03 so as to
continue processing for combining IQ data information of the next
type of the radio signals.
FIG. 16 is a diagram illustrating an example of an operational flow
for combining and decomposing data, according to an embodiment, in
which the details of the processing in step S03 depicted in FIG. 15
is described.
In step S301, the number of pieces of IQ data information and the
IQ data validity information are obtained from the IQ data
arrangement information of the corresponding radio-signal type ID
in the bitmap information 700.
In step S302, the length of the IQ data information is sequentially
obtained from the top of the IQ data information length storing
part 724 included in the IQ data arrangement information.
In step S303, it is determined on the basis of the IQ data validity
information 723 whether or not the obtained length of the IQ data
information is valid. When it is determined that it is valid (YES),
the processing advances to next step S304. When it is determined
that it is not valid (NO), the processing shifts to step S305.
In step S304, the IQ data having a bit length indicated by the
length of the IQ data information obtained in step S302 is set to
the IQ data block.
In step S305, the IQ data setting position pointer is increased by
a bit length indicated by the length of the IQ data
information.
In step S306, it is determined, on the basis of the number of the
IQ data information, whether or not processing of all the pieces of
IQ data information has ended. When the processing of all the
pieces of IQ data information has ended (YES), the processing ends.
When the processing of all the pieces of IQ data information has
not ended (NO), the processing returns to step S302 so as to
perform the processing on the next IQ data information.
With the processing depicted in FIGS. 15 and 16, two pieces of IQ
data for a 3G system and a LTE system depicted in FIGS. 5 and 6 are
arranged and combined into an IQ data block as depicted in FIG. 12.
In the case, bitmap information depicted in FIG. 14 is also
simultaneously combined.
On the other hand, an IQ data block depicted in FIG. 12 can be
decomposed into two IQ data blocks for the 3G system and the LTE
system depicted in FIGS. 5 and 6 on the basis of the bitmap
information depicted in FIG. 14.
As mentioned above, a plural pieces of IQ data information are
arranged in an IQ data block by combining the plural pieces of IQ
data of different types of radio signals on the basis of the bitmap
information, thereby allowing transmitting a plural pieces of IQ
data of different types of radio signals using the same IQ data
block. Thus, as depicted in FIG. 8, the shared RE 30 for supporting
mobile terminals of different mobile communication systems can be
configured and the IQ data can be transmitted and received between
the shared RE 30 and a REC disposed to each of the mobile
communication systems by one CPRI link.
FIG. 17 is a diagram illustrating an example of a transfer sequence
of data, according to an embodiment, in which transfer steps are
denoted by symbols A01 to A09. In FIG. 17, when the data (IQ data)
transmitted from the 3G-REC 10 and the data (IQ data) originating
from the LTE-REC 20 are combined to be transmitted to the RE 30,
and the RE 30 decomposes the received IQ data to transmit the
decomposed IQ data to mobile terminal 1 (3G-MS) for the 3G system
and mobile terminal 2 (LTE-MS) for the LTE system.
In step A01, upon receiving IQ data from the upper device (RNC), a
bitmap information input/output part 12 in the 3G-REC 10 generates
bitmap information, inserts the generated bitmap information into a
specific address of a VS frame of the CPRI, and transmits the
inserted bitmap information together with the IQ data frame to the
LTE-REC 20 via a CPRI communication part 11.
In step A02, the CPRI communication part 21 in the LTE-REC 20 sends
the received frame of the CPRI to a bitmap information input/output
23. The bitmap information input/output 23 picks up an IQ data
block from the IQ data frame of the CPRI, extracts bitmap
information from the specific address of the VS frame, and sends
the extracted IQ data block and the bitmap information to an IQ
data combining/decomposing part 22.
In step A03, when a bitmap information input/output part 25 in the
LTE-REC 20 receives IQ data from the upper device (aGW)
simultaneously with the step A02, the bitmap information
input/output part 25 generates the bitmap information, and sends
the generated bitmap information and received IQ data to the IQ
data combining/decomposing part 22.
In step A04, the IQ data combining/decomposing part 22 combines the
bitmap information of the 3G system received in the step A02 and
the bitmap information of the LTE system received in the step A03
into new bitmap information. Further, a new IQ data block is
generated by calculating and setting the bit position corresponding
to the IQ data, on the basis of the new bitmap information.
Then, the IQ data combining/decomposing part 22 sends the new
bitmap information and the new IQ data block to a bitmap
information input/output part 24.
In step A05, upon receiving the bitmap information, the bitmap
information input/output part 24 inserts the received bitmap
information to a specific address of the VS frame of the CPRI,
outputs the inserted bitmap information together with the IQ data
frame to the CPRI communication part 21a, so as to be transmitted
to the RE 30.
In step A06, the CPRI communication part 31 in the RE 30 sends the
received CPRI signal to a bitmap information input/output part 32.
The bitmap information input/output part 32 extracts the bitmap
information from a predetermined address of the VS frame of the
CPRI signal, extracts the IQ data block from the IQ data frame, and
sends the extracted IQ data block to an IQ data
combining/decomposing part 33.
In step A07, the IQ data combining/decomposing part 33 decompose
the received IQ data block into two IQ data blocks for the 3G
system and the LTE system on the basis of the received bitmap
information (including the bitmap information of the 3G system and
the LTE system). Further, the transmitting destination of the IQ
data is recognized on the basis of the radio signal identification
ID extracted from the bitmap information. When the destination is
the 3G system, the decomposed bitmap information of the 3G system
and the decomposed IQ data of the 3G system are sent to the bitmap
information input/output part 32a. Similarly, when the destination
is the LTE system, the decomposed bitmap information of the LTE
system and the decomposed IQ data of the LTE system are sent to the
bitmap information input/output part 32b.
In step A08, the bitmap information input/output part 32a sends the
received IQ data to the 3G radio communication part 37, and the 3G
radio communication part 37 transmits the received IQ data to the
3G mobile terminal 1 (3G-MS) with a predetermined radio signal.
In step A09, the bitmap information input/output part 32b sends the
IQ data of the LTE system to the radio communication part 38, and
the LTE radio communication part 38 transmits the received IQ data
to the LTE mobile terminal 2 (LTE-MS) with a predetermined radio
signal.
FIG. 18 is a diagram illustrating an example of a transfer sequence
of data, according to an embodiment, in which transfer steps are
denoted by symbols B01 to B07. In FIG. 18, a flow of the data (IQ
data) is depicted when the RE 30 simultaneously receives two radio
signals by from the 3G mobile terminal 1 (3G-MS) and the LTE mobile
terminal 2 (LTE-MS).
In step B01, upon receiving the predetermined radio signal from the
3G mobile terminal 1 (3G-MS), the 3G radio communication part 37 in
the RE 30 sends the IQ data included in the received radio signal
to the bitmap information input/output part 32a. The bitmap
information input/output part 32a adds the bitmap information to
the received IQ data, and sends the IQ data with the bitmap
information to the IQ data combining/decomposing part 33.
In step B02, upon receiving the predetermined radio signal from the
LTE mobile terminal 2 (LTE-MS), concurrently with the processing of
the above step B01, the LTE radio communication part 38 in the RE
30 sends the IQ data included in the received radio signal to the
bitmap information input/output part 32b. The bitmap information
input/output part 32b adds the bitmap information to the received
IQ data, and sends the IQ data with the bitmap information to the
IQ data combining/decomposing part 33.
In step B03, the IQ data combining/decomposing part 33 combines the
received two pieces of bitmap information of the 3G system and the
LTE system into a new piece of bitmap information, generates a new
piece of IQ data by combining the received two pieces of IQ data on
the basis of the combined new piece of bitmap information, and
sends the generated new piece of IQ data to the bitmap information
input/output part 32.
In step B04, the bitmap information input/output part 32 inserts
the received bitmap information and IQ data into the CPRI signal to
be transmitted to the LTE-REC 20 via the CPRI communication part
31.
In step B05, the CPRI signal transmitted from the RE 30 is received
by the CPRI communication part 21a in the LTE-REC 20, and the
bitmap information and the IQ data are extracted from the CPRI
signal by the bitmap information input/output part 24 so as to be
sent to the IQ data combining/decomposing part 22.
In step B06, the IQ data combining/decomposing part 22 decomposes
the received IQ data into parts corresponding to respective types
of the radio signals on the basis of the bitmap information.
Further, the IQ data of the LTE system is sent to the bitmap
information input/output part 25, and the IQ data of the 3G system
is sent to the bitmap inserting/decomposing part 23. The IQ data
sent to the bitmap information input/output part 25 is transmitted
to the upper device (aGW) of the LTE system (not depicted in FIG.
18).
In step B07, the IQ data sent to the bitmap information
input/output 23 is transmitted to the 3G-REC 10 via the CPRI
communication part 21, so as to be transmitted to the upper device
(RNC) of the 3G system (not shown) via the bitmap information
input/output part 12 of the 3G-REC 10.
FIG. 19 is a diagram illustrating an example of a configuration of
monitoring control data, according to an embodiment, which is
request data transmitted from a radio equipment control (REC) to a
radio equipment (RE) via a communication link of the CPRI when the
REC issues a request for maintenance and monitoring to the RE.
A piece of request data 600 includes at least one piece of request
information, and each piece of request information (for example,
600-2) includes a monitoring control type 610, a card number 620,
and a radio-signal type ID 630.
For example, when simultaneously monitoring states of both the
mobile terminal 1 (3G-MS) of the 3G system and the mobile terminal
2 (LTE-MS) of the LTE system, predetermined code indicating a
"state reporting request" is set to the monitoring control type
610, and an identification number of a card, of which the state is
to be reported, is set to the card number 620. Further, information
for identifying the type of the radio signal related to the card,
i.e., information for identifying whether the radio signal of the
3G system or the radio signal of the LTE system, is set to the
radio-signal type ID 630. When request data 600 includes a
plurality of pieces of request information, the RE 30 divides the
received request data 600 into pieces of request information
according to a radio signal identification ID, performs processing
matching the type of the radio signal, and returns the result of
the processing as response data to the REC corresponding to the
type of the radio signal.
FIG. 20 is a diagram illustrating an example of a configuration of
monitoring control data, according to an embodiment, which is
response data transmitted from a radio equipment (RE) in response
to the request data depicted in FIG. 19.
Response data 500 includes at least one piece of response
information. Response information (for example, 500-1) includes: a
monitoring control type 510; a card number 520; a radio-signal type
ID 530; a response result 540; and detailed information 550. Code
information for identifying the type of the response information is
set to the monitoring control type 510. For example, when request
data requesting a report on the status about a card of the 3G
system, is transmitted to the RE 30, code information indicating
the response of a card state report is set to the monitoring
control type 510, the card number of the card is set to 520, and
the radio-signal type ID "1" indicating a radio signal of the 3G
system is set to 530. Further, information indicating OK or NG is
set to the response result 540, and a detailed code indicating the
state is set to the detailed information 550. Then, the response
data including the above mentioned data set thereto is returned to
the REC.
When the RE 30 handles a plurality of types of radio signals (e.g.,
the 3G system and the LTE system), response data in which plural
pieces of response information on a plurality of types of the radio
signals are mixed, is returned to the REC. In a REC according to
the embodiment, the plural pieces of mixed response information in
the response data are decomposed into pieces of response
information corresponding to the respective types of radio signals,
and the pieces of response information are distributed to the
respective RECs each capable of handling the corresponding radio
signal.
With the configuration of monitoring control data depicted in FIGS.
19 and 20, monitoring control data including information on a
plurality of types of radio signals can be transmitted and received
between the 3G-REC 10, the LTE-REC 20, and the RE 30, by using one
communication link as described above with reference to FIG. 8.
Here, the monitoring control data can be transmitted by using the
HDLC frame prescribed by the CPRI.
FIG. 21 is a diagram illustrating an example of a transfer sequence
of monitoring control data, according to an embodiment, in which
symbols C01 to C11 denote transfer steps when two pieces of request
data requesting a report on a card state of a RE are transmitted,
to the RE 30, simultaneously from both the 3G-REC 10 and the
LTE-REC 20. Here, for convenience of explanation, request data is
depicted by a solid arrow, and response data is depicted by a
dotted arrow.
In step C01, in order to transmit to the RE 30 request data as
monitoring control data for a request, a 3G monitoring control part
13 in the 3G-REC 10 generates the request data added with a
radio-signal type ID indicating the 3G system, and transmits the
generated request data to the LTE REC 20 via the CPRI communication
part 11. The monitoring control data of the request data is stored
in the HDLC frame of the CPRI to be transmitted.
In step C02, upon receiving the CPRI signal including the request
data, the CPRI communication part 21 in the LTE-REC 20 sends the
received request data to the monitoring control data
combining/decomposing part 26.
In step C03, upon receiving, simultaneously with the step C01,
request for reporting the status of the RE card from the operation
system (OPS) connected to the LTE-REC 20, the LTE-REC 20 generates
request data added with the radio-signal type ID indicating the LTE
system, and sends the generated data to the monitoring control data
combining/decomposing part 26.
In step C04, the monitoring control data combining/decomposing part
26 combines the request data of the 3G system received in step C02
and the request data of the LTE system received in step C03, into
new combined request data, and transmits the new combined request
data to the RE 30 via the CPRI communication part 21a.
In step C05, the CPRI communication part 31 in the RE 30 sends the
CPRI signal including the received combined request data to the
monitoring control data combining/decomposing part 34.
In step C06, the monitoring control data combining/decomposing part
34 decomposes the combined request data into pieces of data
corresponding to the respective radio-signal types. Further, by
referring to a radio-signal type ID and a type of monitoring and
control are determined, it is determined what request is
transmitted from which system and whether or not a priority control
is required.
For example, when two types of both the request data from the 3G
system (i.e., transmitted from the 3G-REC 10) and of the request
data from the LTE system (i.e., transmitted from the LTE-REC 20)
indicate request data requesting a report on a card state of the RE
30, it is determined that the priority control does not need to be
performed, and then the request data of the 3G system is sent to
the 3G monitoring control part 35 while the request data of the LTE
system is sent to the LTE monitoring control part 36.
In steps C07 and C08, upon receiving the request data, the 3G
monitoring control part 35 and the LTE monitoring control part 36
perform processing in accordance with the received request data,
set the result of the processing to response data which is sent to
the monitoring control data combining/decomposing part 34.
In step C09, the monitoring control data combining/decomposing part
34 receives two pieces of response data from the 3G monitoring
control part 35 and the LTE monitoring control part 36, combines
the received two pieces of response data into new combined response
data which is transmitted to the LTE-REC 20 via the CPRI
communication part 31.
In step C10, the CPRI communication part 21a in the LTE-REC 20
receives the CPRI signal including the combined response data from
the RE 30, and then sends the received combined response data to
the monitoring control data combining/decomposing part 26.
In step C11, the monitoring control data combining/decomposing part
26 decomposes the combined response data into pieces of response
data corresponding to the respective radio-signal types. Then, in
the case, the monitoring control data combining/decomposing part 26
transmits one piece of response data for the 3G system to the
3G-REC 10 via the CPRI communication part 21, and sends the other
piece of response data for the LTE system to the LTE monitoring
control part 27. The LTE monitoring control part 27 transmits the
related information to the operation system (OPS) connected to the
LTE-REC 20 on the basis of the received response data. On the other
hand, the 3G monitoring control part 13 in the 3G-REC 10 transmits
the related information to the operation system (OPS) connected to
the 3G-REC 10 on the basis of the response data transmitted from
the LTE-REC 20.
FIG. 22 is a diagram illustrating an example of a transfer sequence
of monitoring control data, according to an embodiment, in which
symbols D01 to D09 denote transfer steps when only one piece of
request data is transmitted from the 3G-REC 10 to the RE 30. Here,
for convenience of explanation, request data is depicted by a solid
arrow, and response data is depicted by a dotted arrow.
In step D01, a 3G monitoring control part 13 in the 3G-REC 10
transmits request data for controlling a card in the RE 30 in
accordance with an instruction given by an operation system (OPS)
(not depicted in FIG. 22). In this case, identification information
indicating the 3G system is set to the radio-signal type ID in the
request data. The request data is transmitted to the LTE-REC 20 via
the CPRI communication part 11.
In step D02, the CPRI signal including the request data transmitted
in the step D01 is received by the CPRI communication part 21 in
the LTE-REC 20, and is sent to the monitoring control data
combining/decomposing part 26.
In step D03, the monitoring control data combining/decomposing part
26 transmits the request data received from the CPRI communication
part 21 to the RE 30 via the CPRI communication part 21a. This case
is different from the case depicted in FIG. 21, and the request
data from the LTE monitoring control part 27 does not exist.
Therefore, the request data as monitoring control data is not
combined.
In step D04, the CPRI communication part 31 in the RE 30 receives
the CPRI signal including the request data, and then outputs the
request data to the monitoring control data combining/decomposing
part 34.
In step D05, the monitoring control data combining/decomposing part
34 determines, by referring to the radio-signal type ID included in
the request data and the type of monitoring and control, which
request is transmitted from which system. In this case, since only
the request data from the 3G system is received, the request data
of the 3G system is sent to the 3G monitoring control part 35.
In step D06, upon receiving the request data, the 3G monitoring
control part 35 performs processing corresponding to the request
data, and sets the processing result to response data which is sent
to the monitoring control data combining/decomposing part 34. At
this time, identification code (e.g., 1) indicating the 3G system
is set to the radio-signal type ID in the response data.
In step D07, the monitoring control data combining/decomposing part
34 receives the response data for the 3G system, and transmits the
response data to the LTE-REC 20 via the CPRI communication part
31.
In step D08, the CPRI communication part 21a in the LTE-REC 20 that
has received the CPRI signal including the response data, sends the
response data to the monitoring control data combining/decomposing
part 26.
In step D09, since the monitoring control data
combining/decomposing part 26 receives the response data in
response to the request data from the 3G system, the monitoring
control data combining/decomposing part 26 transmits the response
data to the 3G-REC 10 via the CPRI communication part 21. The 3G
monitoring control part 13 in the 3G-REC 10 receives the response
data, then performs processing corresponding to contents of the
response data, and sends the notification to the operation system
(OPS) (not depicted in FIG. 22) as needed.
FIG. 23 is a diagram illustrating an example of a transfer sequence
of monitoring control data, according to an embodiment, in which
symbols E01 to E10 denote transfer steps when two pieces of request
data from both the 3G-REC 10 and the LTE-REC 20 are simultaneously
transmitted to the RE 30 and the priority control is performed by
the RE 30. Here, for convenience of explanation, request data is
depicted by a solid arrow, and response data is depicted by a
dotted arrow.
In step E01, in order to transmit request data to the RE 30, the 3G
monitoring control part 13 of the 3G-REC 10 generates the request
data added with the radio-signal type ID indicating the 3G system,
and transmits the generated request data to the LTE-REC 20 via the
CPRI communication part 11.
In step E02, the CPRI communication part 21 in the LTE-REC 20
receives the CPRI signal including the request data from the 3G-REC
10, and sends the received request data to the monitoring control
data combining/decomposing part 26.
In step E03, upon receiving, simultaneously with the step E02, a
request for reporting a card state of the RE from the operation
system (OPS) (not depicted in FIG. 23) connected to the LTE-REC 20,
the LTE-REC 20 generates the request data added with the
radio-signal type ID indicating the LTE system, and sends the
generated request data to the monitoring control data
combining/decomposing part 26.
In step E04, the monitoring control data combining/decomposing part
26 combines the request data of the 3G system received in step E02
and the request data of the LTE system received in step E03 into
new combined request data, and transmits the new combined request
data to the RE 30 via the CPRI communication part 21a.
In step E05, the CPRI communication part 31 in the RE 30 sends the
received CPRI signal including the combined request data to the
monitoring control data combining/decomposing part 34.
In step E06, the monitoring control data combining/decomposing part
34 in the RE 30 decomposes the combined request data into pieces of
request data, and determines which request is transmitted from
which system and whether or not the priority control is required,
by referring to the radio-signal type ID and the type of monitoring
and control included in the decomposed pieces request data. For
example, when the request data from the 3G system is a system reset
request to the RE 30, it is determined that the execution of
priority control is needed because the LTE system will be
influenced thereby, and the request data of the 3G system is
transmitted to the 3G monitoring control part 35, and the request
data of the LTE system is discarded, in this case, because of
competition with the system reset requested by the request data
from the 3G system.
In step E07, upon receiving the request data, the 3G monitoring
control part 35 performs processing requested by the request data,
sets the result of the processing to response data, and sends the
response data including the processing result to the monitoring
control data combining/decomposing part 34.
In step E08, upon receiving the response data of the 3G system
indicating that the RE 30 has been reset, the monitoring control
data combining/decomposing part 34 determines that the notification
is needed for the LTE system because the RE 30 has been reset and
the signal of the LTE system has been discarded thereby. As a
consequence, the response data for the LTE system is generated.
Further, the generated response data for the LTE system and the
response data from the 3G system are combined into a new combined
response data which is transmitted to the LTE-REC 20 via the CPRI
communication part 31.
In step E09, the CPRI signal including the combined response data
transmitted from the RE 30 is received by the CPRI communication
part 21a in the LTE-REC 20, and is sent to the monitoring control
data combining/decomposing part 26.
In step E10, the monitoring control data combining/decomposing part
26 decomposes the combined response data into two pieces of
response data, transmits one of the two pieces of response data for
the 3G system to the 3G-REC 10 via the CPRI communication part 21,
and sends the other one of the two pieces of response data for the
LTE system to the LTE monitoring control part 27.
The 3G monitoring control part 13 in the 3G-REC 10 and the LTE
monitoring control part 27 in the LTE-REC 20 receive the response
data and perform processing in accordance with the contents
included in the response data.
FIG. 24 is a diagram illustrating an example of an operational flow
for monitoring and control, according to an embodiment, in which a
plurality of pieces of request data on a plurality of radio-signal
types are combined into one new piece of the monitoring control
data by a monitoring control data combining/decomposing part 26 in
the LTE-REC 20.
In step S401, data is received.
In step S402, it is determined whether or not request data is
received. When request data is received (YES), the processing
advances to next step S403. When request data is not received (NO),
the processing returns to step S401 so as to receive request
data.
In step S403, the radio-signal type ID is extracted from the
received request data.
In step S404, it is determined whether or not a plural radio-signal
type IDs are included in the received request data. When a plural
radio-signal type IDs are included therein (YES), the processing
advances to next step S405. When a plural radio-signal type IDs are
not included therein (NO), the processing shifts to step S406.
In step S405, a plural pieces of request data on the plural
radio-signal type IDs are combined into new request data. Then, the
processing ends.
In step S406, the request data corresponding to one radio-signal
type ID is extracted, and the processing ends.
FIG. 25 is a diagram illustrating an example of an operational flow
for monitoring and control, according to an embodiment, in which a
priority control is performed by the monitoring control data
combining/decomposing part 34 in the RE 30 that has received the
combined request data.
In step S501, data is received.
In step S502, it is determined whether or not request data is
received. When request data is received (YES), the processing
advances to next step S503. When request data is not received (NO),
the processing returns to step S501 so as to receive request
data.
In step S503, a radio-signal type ID is extracted from the received
request data.
In step S504, it is determined whether or not a plurality of pieces
of request data on a plurality of radio-signal types is included
the received request data. When a plurality of pieces of request
data on a plurality of radio-signal types is included therein
(YES), the processing advances to next step S505. When only one
piece of request data on one radio-signal type is included therein
(NO), the processing shifts to step S509.
In step S505, parameters included in the plurality of pieces of
request data are compared with each other and are analyzed. The
comparison and analysis are realized by registering parameters
needed for the priority control in a table in advance and comparing
the parameters with each other.
In step S506, it is determined, on the basis of the analyzed result
in step S505, whether or not the priority control is required. When
the priority control is required (YES), the processing advances to
next step S507. When the priority control is not required (NO), the
processing shifts to step S508.
In step S507, a piece of decomposed request data associated with a
type of radio signal requiring priority control, is sent to the
monitoring control part corresponding to the associated type of
radio signal, and the processing ends.
In step S508, a plurality of pieces of request data decomposed in
association with a plurality of radio-signal types are sent to the
respective monitoring control parts corresponding to the plurality
of different radio-signal types, and the processing ends.
In step S509, the request data is sent to the monitoring control
part corresponding to the one radio-signal type, and the processing
ends.
FIG. 26 is a diagram illustrating an example of an operational flow
for monitoring and control, according to an embodiment, in which
response data is generated by the monitoring control data
combining/decomposing part 34 in the RE 30.
In step S601, response data as a reply to the request data is
received from each of monitoring control parts corresponding to the
respective radio-signal types.
In step S602, it is determined whether or not all the pieces of
response data as a reply to the request data sent just before are
received. When all the pieces of response data are received (YES),
the processing advances to next step S603. When all the pieces of
response data are not received (NO), the processing returns to step
S601 so as to receive a next piece of response data.
In step S603, it is determined whether or not the received response
data includes plural pieces of monitoring control data on a
plurality of radio-signal types. When the received response data
includes plural pieces of monitoring control data (YES), the
processing advances to next step S604. When the received response
data does not include plural pieces of monitoring control data
(NO), the processing shifts to step S606.
In step S604, the received pieces of response data are combined
into new response data.
In step S605, the new response data is outputted, and the
processing ends.
In step S606, it is determined whether or not the received response
data is a reply to the request data of priority control. When the
received response data is a reply to the request data of priority
control (YES), the processing advances to next step S607. When the
received response data is not a reply to the request data of
priority control (NO), the processing shifts to step S605.
In step S607, response data as a reply to the request data
discarded by the priority control is generated, and the generated
response data and the received response data are combined into new
response data. Then, the processing shifts to step S605.
FIG. 27 is a diagram illustrating an example of an operational flow
for monitoring and control, according to an embodiment, in which
the combined response data from the RE 30 is received by the
monitoring control data combining/decomposing part 26 in the
LTE-REC 20.
In step S701, the monitoring control data combining/decomposing
part 26 in the LTE-REC 20 receives the response data from the RE
30.
In step S702, it is determined whether or not the received response
data is a reply to the request data transmitted just before. When
the received response data is a reply to the request data
transmitted just before (YES), the processing shifts to next step
S703. When the received response data is not a reply to the request
data transmitted just before (NO), the processing returns to step
S701 so as to wait for receiving response data.
In step S703, the received response data is decomposed into pieces
of response data according to the respective radio-signal types
thereof.
In step S704, each of the decomposed pieces of response data is
sent to the monitoring control part in the REC corresponding to the
radio-signal type thereof, and the processing ends.
As described above, according to an embodiment, a plurality of
different types of radio signal data can be stored in the same
transfer frame so as to be simultaneously transmitted or
received.
Further, according to an embodiment, the CPRI specification can be
used as a standard transmission method between the radio equipment
control (REC) and the radio equipment (RE), thereby efficiently
structuring the mobile communication system.
According to another embodiment, the mobile communication system
including various mixed types of radio signal can be efficiently
configured without depending on the size of IQ data information and
the number of pieces of IQ data information which are different in
accordance with the type of the used radio signal.
Further, according to an embodiment, a plurality of different types
of the data can be transmitted and received between the radio
equipment control (REC) and the radio equipment (RE) by one
communication link (e.g., CPRI communication link).
That is, the data is received and transmitted between the radio
equipment (RE), which is capable of communicate with a plurality of
mobile terminals by using a plurality of types of radio signals,
and a plurality of radio equipment controls (RECs) provided for the
respective types of radio signals, with one communication link
chaining the plurality of RECs in a row.
Between the radio equipment controls (RECs) provided corresponding
to the mobile communication systems and the shared radio equipment
(RE), the data of a plurality of the mobile communication systems
can be transmitted and received by using one communication link.
Upon structuring a system having different types of the mobile
communication systems, the RE does not need to be disposed every
mobile communication system, and the base terminal stations
corresponding to a plurality of mobile communication systems can be
efficiently structured with low costs.
All examples and conditional language recited herein are intended
for pedagogical purposes to aid the reader in understanding the
embodiment and the concepts contributed by the inventor to
furthering the art, and are to be construed as being without
limitation to such specifically recited examples and condition, nor
does the organization of such examples in the specification relate
to a showing of superiority and inferiority of the embodiment.
Although the embodiments have been described in detail, it should
be understood that the various changes, substitutions, and
alternations could be made hereto without departing from the spirit
and scope of the invention.
* * * * *
References